The atomic number of oxygen is 8 because oxygen has?<\/p>\n\n\n\n
8 protons in the nucleus.
electrons in 8 shells.
a second shell with 8 electrons.
an atomic mass of 8.<\/p>\n\n\n\n
The correct answer and explanation is :<\/strong><\/mark><\/p>\n\n\n\n Correct Answer: 8 protons in the nucleus.<\/strong><\/p>\n\n\n\n The atomic number of an element is a fundamental property that defines the identity of that element. The atomic number is determined by the number of protons present in the nucleus of an atom<\/strong>. Each element has a unique number of protons, and this number is what gives the element its atomic number and place in the periodic table.<\/p>\n\n\n\n For oxygen<\/strong>, the atomic number is 8<\/strong>, which means that every atom of oxygen has 8 protons in its nucleus<\/strong>. This is the key characteristic that distinguishes oxygen from all other elements. If the number of protons were to change, the atom would no longer be oxygen; it would become a different element entirely.<\/p>\n\n\n\n Now, in a neutral atom<\/strong>, the number of electrons<\/strong> equals the number of protons. So a neutral oxygen atom also has 8 electrons<\/strong>. These electrons are arranged in energy levels or shells<\/strong> around the nucleus. The first shell can hold up to 2 electrons, and the second shell can hold up to 8 electrons. For oxygen, 2 electrons fill the first shell, and the remaining 6 go into the second shell\u2014not 8. Therefore, the option that says \u201ca second shell with 8 electrons\u201d is incorrect.<\/p>\n\n\n\n Additionally, oxygen does not have electrons in 8 shells<\/strong>. It only has 2 occupied shells<\/strong>. Atoms with electrons in 8 shells belong to elements with much higher atomic numbers (well beyond 100).<\/p>\n\n\n\n Lastly, atomic mass<\/strong> is a separate concept from atomic number. The atomic mass of oxygen is approximately 16<\/strong>, which is the sum of the protons and neutrons in the nucleus, not 8.<\/p>\n\n\n\n In conclusion, oxygen has an atomic number of 8 because it contains 8 protons in its nucleus<\/strong>, and this is what defines it as the element oxygen. This makes “8 protons in the nucleus” the correct and scientifically accurate answer.<\/p>\n","protected":false},"excerpt":{"rendered":" The atomic number of oxygen is 8 because oxygen has? 8 protons in the nucleus.electrons in 8 shells.a second shell with 8 electrons.an atomic mass of 8. The correct answer and explanation is : Correct Answer: 8 protons in the nucleus. Explanation (300+ words): The atomic number of an element is a fundamental property that […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[25],"tags":[],"class_list":["post-207986","post","type-post","status-publish","format-standard","hentry","category-exams-certification"],"_links":{"self":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/posts\/207986","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/comments?post=207986"}],"version-history":[{"count":0,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/posts\/207986\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/media?parent=207986"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/categories?post=207986"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/tags?post=207986"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}
\n\n\n\nExplanation (300+ words):<\/strong><\/h3>\n\n\n\n